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driver core: Avoid NULL pointer dereferences in device_is_bound() 

If device_is_bound() is called on a device that's not been registered
yet, it will attepmt to dereference dev->p which is NULL, so avoid
that by checking dev->p in there against NULL.

Fixes: 6b9cb42752 "device core: add device_is_bound()"
Reported-and-tested-by: Guenter Roeck <linux@roeck-us.net>
Tested-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Rafael J. Wysocki 2016-01-12 01:51:44 +01:00
parent 2d30bb0b38
commit 3ded91041a
1 changed files with 1 additions and 1 deletions
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2
drivers/base/dd.c
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@ -234,7 +234,7 @@ late_initcall(deferred_probe_initcall);
*/
bool device_is_bound(struct device *dev)
{
return klist_node_attached(&dev->p->knode_driver);
return dev->p && klist_node_attached(&dev->p->knode_driver);
}
static void driver_bound(struct device *dev)